@article{DE_1997_33_5_a8,
     author = {N. A. Izobov},
     title = {On a lower exponent of a two-dimensional linear system with {Perron} perturbations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {623--631},
     publisher = {mathdoc},
     volume = {33},
     number = {5},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_5_a8/}
}